Parallelize for performance, relationship resolver improvements #1336

Job	Run time
build_NetCore (Debug_NetCore)	1m 1s
build_NetCore (Release_NetCore)	59s
build (6.8, Debug)	1m 25s
build (6.8, Release)	2m 18s
build (6.10, Debug)	1m 51s
build (6.10, Release)	1m 29s
build (6.12, Debug)	1m 33s
build (6.12, Release)	2m 3s
build (latest, Debug)	1m 53s
build (latest, Release)	2m 5s
	16m 37s

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